Operation
Calculating the Calibration Factor
Use the following tables and formulas to calculate the change to make to the calibration factor.
Example of Calibration Factor Change
Dispense 1,000 milliliters, with the amount displayed, into a clean calibrated volumetric measuring flask. For
increased accuracy, submerge the nozzle, and let the air settle out of the fluid for ten minutes before you note the
volume. Reading the flask shows the volume to be 3 cubic centimeters less than 1,000 liters. Reference the
left-column of the Metric Measurement table. Look down the column until you find the closest number to –3,
which is between –2,50 and –5,00. Pick –2,50, and go to the right column to find that the calibration factor should
change by +17. If the current calibration factor is 6815, add 17 to get the new calibration factor of 6832; therefore,
change 6815 to 6832. See Calibrating the Meter on page 12 for instructions on changing the calibration factor.
Metric Measurement
Measuring in liters, and 1 liter is dispensed
Error in Cubic
Centimeters (cm
3
)
Change Calibration
Factor by:
+15,00
–102
+12,50
–85
+10,00
–68
+7,50
–51
+5,00
–34
+2,50
–17
0,000
no change
–2,50
+17
–5,00
+34
–7,50
+51
–10,00
+68
–12,50
+85
–15,00
+102
Formulas:
If dispensed amount is greater than desired:
New CF = Old CF – (Error in
cm
3
/ 1,1467)
If dispensed amount is less than desired:
New CF = Old CF + (Error in
cm
3
/ 1,1467)
where:
CF = calibration factor
1,1467 = constant
US Measurement
Measuring in quarts, and 1 quart is dispensed
Error in Cubic
Inches (in.
3
)
Change Calibration
Factor by:
+3.46
–102
+2.88
–85
+2.30
–68
+1.73
–51
+1.15
–34
+0.57
–17
0.000
no change
–0.57
+17
–1.15
+34
–1.73
+51
–2.30
+68
–2.88
+85
–3.46
+102
Formulas:
If dispensed amount is greater than desired:
New CF = Old CF – (Error in
in.
3
/ 0.0339)
If dispensed amount is less than desired:
New CF = Old CF + (Error in
in.
3
/ 0.0339)
where
CF = calibration factor
0.0339 = constant
Summary of Contents for EM 238-451
Page 19: ...Notes...
